Wind-solar hydrogen production system and wind-solar hydrogen production method

Abstract

The present invention relates to a wind-solar hydrogen production system and a method for wind-solar hydrogen production, wherein the wind-solar hydrogen production system includes: a photovoltaic power generation module, a wind power generation module, a water electrolysis hydrogen production module and a low-pressure hydrogen storage module, wherein the water electrolysis hydrogen production module is connected to the low-pressure hydrogen storage module by a pipeline, and a positive water seal and a reverse water seal are provided on the pipeline. The wind-solar hydrogen production system of the present invention can stabilize the hydrogen outlet pressure (3-20kPa) of the wind-solar hydrogen production electrolyzer, thereby continuously providing a stable hydrogen consumption for the downstream hydrogen module. Wherein, the stable low-pressure hydrogen storage module pressure is made to not fluctuate with the fluctuation of the wind-solar power generation power load by "positive and reverse water seals", thereby keeping the hydrogen-oxygen pressure difference of the electrolyzer stable. The present invention sets a low-pressure hydrogen storage module of corresponding volume according to the cumulative hydrogen production of the electrolyzer in 24 hours and the stable hydrogen demand consumption per hour of downstream customers, which can provide a stable consumption of 24 hours for downstream hydrogen.

Description

Technical Field

[0001] The present invention belongs to the field of green energy technology, and specifically relates to a wind-solar hydrogen production system and a wind-solar hydrogen production method, especially a stable wind-solar hydrogen production system and a wind-solar hydrogen production method. Background Art

[0002] With the continuous development of wind and photovoltaic power generation technologies, the proportion of renewable energy in my country's power generation is increasing, and the amount of renewable energy generated is also increasing. Hydrogen, as a carrier of clean energy, is a key component of China's energy transition. According to my country's hydrogen energy planning and market demand, hydrogen demand is expected to experience explosive growth in the future. Currently, the main source of hydrogen is fossil fuel production, which emits significant amounts of greenhouse gases during the production process. Hydrogen production through water electrolysis can produce high-purity hydrogen with near-zero carbon emissions. Water electrolysis is the primary method for producing green hydrogen and is powered by the main power grid. However, electricity costs lead to high production costs, making it less costly than fossil fuel-based hydrogen. Therefore, to reduce the cost of water electrolysis and promote the uptake of new energy, combining renewable energy with water electrolysis technology to achieve the conversion of electricity into hydrogen will help promote the development of my country's hydrogen energy industry.

[0003] However, wind power output is subject to significant fluctuations due to the influence of natural wind conditions. This volatility manifests itself primarily in two ways: a large diurnal variability, meaning that wind power output fluctuates significantly within a single day; and a large seasonal variability, meaning that wind power output varies significantly between seasons. This volatility contributes to the strong seasonality and intermittency of wind power generation. Similarly, the output of photovoltaic power generation systems is directly affected by natural conditions, particularly variations in solar irradiance. When solar irradiance intensity fluctuates rapidly, the output of photovoltaic power generation systems fluctuates rapidly over a wide range. This volatility also contributes to the randomness and intermittency of photovoltaic power generation systems. Due to the uncertainty of natural conditions, the output of both wind and photovoltaic power generation systems is subject to uncertainty and volatility. This volatility not only affects the stability of the power generation system but also impacts downstream hydrogen consumption systems. Specifically, during hydrogen production from wind and solar power generation, this volatility can cause fluctuations in the hydrogen-oxygen pressure in the hydrogen electrolyzer, which in turn reduces the electrolyzer's lifespan and increases safety risks. At the same time, this volatility will also reduce the quality and purity of hydrogen, resulting in the inability to provide a stable amount of hydrogen to downstream users. Summary of the Invention

[0004] In order to improve the above technical problems, the present invention provides a wind-solar hydrogen production system, which includes: a photovoltaic power generation module, a wind power generation module, a water electrolysis hydrogen production module and a low-pressure hydrogen storage module, wherein the water electrolysis hydrogen production module and the low-pressure hydrogen storage module are connected by a pipeline, and a positive water seal and a reverse water seal are provided on the pipeline.

[0005] According to an embodiment of the present invention, in the wind-solar hydrogen production system, the photovoltaic power generation module and the wind power generation module are arranged in parallel and connected in series with the water electrolysis hydrogen production module, thereby providing energy for the water electrolysis hydrogen production module.

[0006] According to an embodiment of the present invention, the water electrolysis hydrogen production module is connected to the positive water seal and the reverse water seal through pipelines.

[0007] According to an embodiment of the present invention, the positive water seal and reverse water seal may be positive water seal and reverse water seal devices known in the art.

[0008] According to an exemplary embodiment of the present invention, the positive water seal has a first air inlet at its top left end and a first air outlet at its top right end. The reverse water seal has a second air outlet at its top left end and a second air inlet at its top right end. The first air inlet of the positive water seal is connected to the second air outlet of the reverse water seal, and the first air outlet of the positive water seal is connected to the second air inlet of the reverse water seal. This achieves intrinsic safety by combining the three functions of backflow prevention, pressure stabilization, and fire prevention.

[0009] According to an embodiment of the present invention, the positive water seal is further provided with a first water replenishment port, a first liquid level display and control port, and a first drain port.

[0010] According to an embodiment of the present invention, a first sight glass (for example, the first sight glass is circular) is further provided on the positive water seal for observation.

[0011] According to an embodiment of the present invention, the reverse water seal is further provided with a second water replenishment port, a second liquid level display, a second control port and a drain port.

[0012] According to an embodiment of the present invention, a second viewing mirror (for example, the second viewing mirror is circular) is further provided on the reverse water seal for observation.

[0013] According to an embodiment of the present invention, the wind-solar hydrogen production system further includes a DCS (Distributed Control System) control system.

[0014] According to an embodiment of the present invention, the low-pressure hydrogen storage module is connected to the positive water seal and the reverse water seal through pipelines.

[0015] According to an embodiment of the present invention, the wind-solar hydrogen production system further includes a hydrogen compression module, which is connected to the water electrolysis hydrogen production module, the positive water seal, and the reverse water seal via pipelines. For example, the hydrogen compression module is a water ring hydrogen compressor.

[0016] According to an embodiment of the present invention, the wind-solar hydrogen production system further includes a downstream hydrogen module located downstream of the hydrogen compression module, and the downstream hydrogen module is connected to the hydrogen compression module through a pipeline.

[0017] According to an embodiment of the present invention, the wind-solar hydrogen production system further includes an oxygen collection module, which is connected to the anode electrode of the water electrolysis hydrogen production module.

[0018] According to an embodiment of the present invention, the wind-solar hydrogen production system may further include an electric energy storage module, which is arranged between the photovoltaic power generation module, the wind power generation module and the water electrolysis hydrogen production module, or arranged within the water electrolysis hydrogen production module, so that the electric energy generated by the photovoltaic power generation module and the wind power generation module is stored in the electric energy storage module, so that the electric energy storage module supplies power to the water electrolysis hydrogen production module. As an example, when the wind-solar hydrogen production system includes an electric energy storage module, the photovoltaic power generation module and the wind power generation module are connected in parallel with the electric energy storage module so that the electric energy is stored in the electric energy storage module, and the electric energy storage module provides energy for the water electrolysis hydrogen production module.

[0019] According to an embodiment of the present invention, the electrical energy storage module is selected from one or more of a gravity energy storage module, a chemical energy storage module and a battery energy storage module.

[0020] According to an embodiment of the present invention, a pressure regulating module, such as a pressure regulating valve, is provided at the hydrogen outlet of the water electrolysis hydrogen production module.

[0021] According to an embodiment of the present invention, the water electrolysis hydrogen production module may be an electrolyzer for water electrolysis hydrogen production known in the art.

[0022] According to an exemplary embodiment of the present invention, a cathode electrode is provided at the top left end of the electrolytic water hydrogen production module, and the cathode electrode is connected to the positive water seal and the reverse water seal through a pipeline; an anode electrode is provided at the top right end of the electrolytic water hydrogen production module, and the anode electrode is connected to the oxygen collection module through a pipeline.

[0023] According to an embodiment of the present invention, the low-pressure hydrogen storage module is a hydrogen gas tank, for example, a wet single-section vertical lift gas tank.

[0024] According to an exemplary embodiment of the present invention, the low-pressure hydrogen storage module includes a water storage unit and a sealing unit disposed above the water storage unit. Preferably, the water storage unit is, for example, a water tank; and the sealing unit can be selected from a sealing cover, such as a bell jar.

[0025] In one embodiment of the present invention, the water storage unit and the enclosed unit are connected by a guide rail. Preferably, the guide rail is a vertical lift guide rail, so that the liquid level of the low-pressure hydrogen storage module rises and falls with pressure changes, thereby achieving the purpose of pressure stabilization.

[0026] In one embodiment of the present invention, a third air inlet is provided on the water storage unit, and the first air outlet of the positive water seal and the second air inlet of the reverse water seal are respectively connected to the third air inlet through pipelines.

[0027] In one embodiment of the present invention, a counterweight is provided on the top of the closed unit to adjust the pressure in the water storage unit.

[0028] In one embodiment of the present invention, the low-pressure hydrogen storage module is further provided with a liquid level monitoring unit. For example, the liquid level monitoring unit is a liquid level gauge. The liquid level gauge is used to monitor the liquid level in the low-pressure hydrogen storage module in real time and transmit the information to the control system.

[0029] In one embodiment of the present invention, the water storage unit is provided with a third water replenishment port, a steam inlet, a circulating water inlet, a steam condensate outlet, a drain port, a replacement drain port and a condensate drain port to achieve hydrogen storage.

[0030] In one embodiment of the present invention, a replacement port and a venting port are provided on the closed unit to achieve the purpose of system replacement and safe operation of starting and stopping.

[0031] According to an embodiment of the present invention, the wind-solar hydrogen production system includes a photovoltaic power generation module and a wind power generation module arranged in parallel, an electrical energy storage module, a water electrolysis hydrogen production module, a positive water seal and a reverse water seal, a low-pressure hydrogen storage module, a hydrogen compression module and a downstream hydrogen use module, wherein the water electrolysis hydrogen production module, the hydrogen compression module and the low-pressure hydrogen storage module are respectively connected to the positive water seal and the reverse water seal through pipelines.

[0032] According to an embodiment of the present invention, the hydrogen storage capacity V of the low-pressure hydrogen storage module 储 It complies with the following formula (1):

[0033] V 储 =V h ×24 (1)

[0034] Among them, V h The hourly hydrogen consumption of the downstream hydrogen module.

[0035] According to an embodiment of the present invention, the hydrogen production capacity V of the water splitting hydrogen production module is 产 It complies with the following formula (2):

[0036] V 产 =V 储 / T (2)

[0037] Wherein, T is the cumulative full-load operation time of the water decomposition hydrogen production module.

[0038] According to an embodiment of the present invention, the hydrogen outlet pressure of the water electrolysis hydrogen production module is 3-20 kPa.

[0039] According to an embodiment of the present invention, the hydrogen outlet pressure of the low-pressure hydrogen storage module is 2-15 kPa.

[0040] According to an embodiment of the present invention, preferably, the design pressure value of the low-pressure hydrogen storage module is determined according to the design parameters of the hydrogen compressor inlet.

[0041] The present invention also provides a method for producing hydrogen from wind and solar power, comprising producing hydrogen using the aforementioned wind and solar power generation system. Preferably, the electricity generated by the photovoltaic and wind power generation modules serves as the energy source for the water electrolysis hydrogen production module, which produces hydrogen and oxygen. The hydrogen produced by the water electrolysis hydrogen production module is then transferred through a positive water seal to a low-pressure hydrogen storage module for storage.

[0042] According to an embodiment of the present invention, the method for producing hydrogen from wind and solar power comprises the following steps:

[0043] S1. The electricity generated by the photovoltaic power generation module and the wind power generation module supplies power to the water electrolysis hydrogen production module. The water electrolysis hydrogen production module electrolyzes water to produce hydrogen and oxygen. The prepared hydrogen is stored in the low-pressure hydrogen storage module after passing through a positive water seal, and / or is compressed by a hydrogen compression module (such as a water ring hydrogen compressor) for use by the downstream hydrogen use module;

[0044] S2. When the power generation of the photovoltaic power generation module and the wind power generation module is greater than the power consumption of the water electrolysis hydrogen production module, the energy storage module works to store the excess power generation;

[0045] S3. When the hydrogen storage in the low-pressure hydrogen storage module exceeds the preset maximum value, the hydrogen is fed back to the water electrolysis hydrogen production module, which stops working or reduces the power. The excess power generation is stored in the electric energy storage module.

[0046] S4. When the power generation of the photovoltaic power generation module and the wind power generation module is less than the power consumption of the water electrolysis hydrogen production module, the hydrogen stored in the low-pressure hydrogen storage module is consumed first (the hydrogen stored in the low-pressure hydrogen storage module is compressed by the hydrogen compression module through the reverse water seal and supplied to the downstream hydrogen module while flowing back to the water electrolysis hydrogen production module to stabilize the hydrogen outlet pressure of the water electrolysis hydrogen production module); when the hydrogen stored in the low-pressure hydrogen storage module is less than the preset minimum value, the electric energy storage module is turned on to supply power to the water electrolysis hydrogen production module.

[0047] According to an embodiment of the present invention, in step S1, the hydrogen outlet pressure of the water electrolysis hydrogen production module is 3-20 kPa.

[0048] According to an embodiment of the present invention, in step S1, the temperature in the water electrolysis hydrogen production module is controlled at 80-90°C.

[0049] Beneficial effects:

[0050] (1) The wind-solar hydrogen production system of the present invention can stabilize the hydrogen outlet pressure (3-20kPa) of the electrolyzer of the wind-solar hydrogen production module, thereby continuously providing a stable amount of hydrogen for the downstream hydrogen module. Among them, the stable low-pressure hydrogen storage module pressure is prevented from fluctuating widely with the fluctuation of the wind-solar power generation load by the “positive and reverse water seals” (i.e., positive water seals and reverse water seals) at the hydrogen side outlet of the hydrogen production electrolyzer, thereby maintaining the stability of the hydrogen-oxygen pressure difference of the electrolyzer. The present invention sets a low-pressure hydrogen storage module of corresponding volume according to the cumulative hydrogen production of the electrolyzer in 24 hours and the stable hydrogen demand per hour of the downstream customers, which can provide a stable amount of hydrogen for 24 hours for the downstream. At the same time, the present invention prevents the hydrogen stored in the low-pressure hydrogen storage module from flowing back to the electrolytic water hydrogen production module and the hydrogen pipeline connected thereto by setting a “reverse” water seal, so that the hydrogen pressure in the low-pressure hydrogen storage module is always kept at a constant pressure, so that the inlet pressure of the hydrogen compression module connected thereto is constant, thereby promoting the stable operation of the compressor of the hydrogen compression module to extend its service life.

[0051] (2) The synergistic effect of the forward and reverse water seals and the low-pressure hydrogen storage module in the wind-solar hydrogen production system of the present invention has the following advantages compared with high-pressure hydrogen storage equipment such as high-pressure spherical tanks:

[0052] 1. The low-pressure hydrogen storage module has a constant and low pressure, which reduces the risk of hydrogen leakage and increases safety.

[0053] 2. The low-pressure hydrogen storage module serves as the outlet pressure of the hydrogen pressure regulating valve of the water electrolysis hydrogen production system, reducing the difficulty of adjusting the hydrogen side pressure regulating valve of the water electrolysis hydrogen production module caused by fluctuations in the wind power generation module and the photovoltaic power generation module, thereby reducing the hydrogen pressure fluctuation of the water electrolysis hydrogen production module and thus reducing the fluctuation of hydrogen quality.

[0054] 3. The hydrogen pressure of the hydrogen storage module will not change with the changes in the hydrogen production volume of the hydrogen production module and the downstream hydrogen consumption, but can always maintain a constant hydrogen pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is a schematic diagram of a wind-solar hydrogen production system according to the present invention;

[0056] Figure 2 It is a structural schematic diagram of the positive water seal and the reverse water seal of the present invention;

[0057] Figure 3 Schematic diagram of the structure of the low-pressure hydrogen storage module of the present invention;

[0058] The reference numerals have the following meanings:

[0059] 1-1: Wind power generation module; 1-2: Photovoltaic power generation module; 2: Water electrolysis hydrogen production module; 3-1: Positive water seal; 311: First air inlet; 312: First air outlet; 313: First water supply port; 314: First liquid level display and control port; 315: First drain port; 316: First sight glass; 3-2: Reverse water seal; 321: Second air inlet; 322: Second air outlet; 323: Second water supply port; 324: Second liquid level display and control port; 325: Second drain outlet; 326: Second sight glass; 4: Low-pressure hydrogen storage module; 41: Water storage unit; 411: Third water replenishment port; 412: Steam inlet; 413: Circulating water inlet; 414: Steam condensate outlet; 415: Drain port; 416: Third air inlet; 417: Displacement drain port; 418: Condensate drain port; 42: Enclosed unit; 421: Displacement port; 422: Vent port; 5: Hydrogen compression module; 6: Downstream hydrogen module; 7: Oxygen collection module. DETAILED DESCRIPTION

[0060] The technical solutions of the present invention will be described in further detail below with reference to specific embodiments. It should be understood that the following embodiments are merely illustrative and explanations of the present invention and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are encompassed within the scope of protection that the present invention is intended to protect.

[0061] Unless otherwise specified, the raw materials and reagents used in the following examples are commercially available or can be prepared by known methods.

[0062] Example 1: Wind-solar hydrogen production system

[0063] Reference Figure 1 This embodiment provides a wind-solar hydrogen production system, which includes a photovoltaic power generation module 1-1 and a wind power generation module 1-2 arranged in parallel, an electric energy storage module, a water electrolysis hydrogen production module 2, a positive water seal 3-1 and a reverse water seal 3-2, a low-pressure hydrogen storage module 4, a hydrogen compression module 5 and a downstream hydrogen use module 6, wherein the water electrolysis hydrogen production module 2, the hydrogen compression module 5 and the low-pressure hydrogen storage module 4 are respectively connected to the positive water seal 3-1 and the reverse water seal 3-2 through pipelines, and the downstream hydrogen use module 6 is connected to the hydrogen compression module 5 through a pipeline.

[0064] Preferably, the wind-solar hydrogen production system further includes an electric energy storage module ( Figure 1(not shown), the electric energy generated by the photovoltaic power generation module 1-2 and the wind power generation module 1-1 is stored in the electric energy storage module, so that the electric energy storage module supplies power to the water electrolysis hydrogen production module 2; wherein, the electric energy storage module is selected from one or more of a gravity energy storage module, a chemical energy storage module and a battery energy storage module.

[0065]

Water electrolysis hydrogen production module

[0066] A cathode electrode is provided at the top left end of the electrolytic water hydrogen production module 2, and a hydrogen tube is sleeved on the top of the cathode electrode. The outside of the hydrogen tube is connected to the positive water seal 3-1 and the reverse water seal 3-2; an anode electrode is provided at the top right end of the electrolytic water hydrogen production module 2, and an oxygen tube is sleeved on the top of the anode electrode. The outside of the oxygen tube is connected to the oxygen collection module 7.

[0067]

Positive water seal, reverse water seal

[0068] The positive water seal has a first air inlet 311 at its top left end, and a first air outlet 312 at its top right end. The reverse water seal has a second air outlet 322 at its top left end, and a second air inlet 321 at its top right end. The positive water seal's first air inlet 311 is connected to the reverse water seal's second air outlet 322, and the positive water seal's first air outlet 312 is connected to the reverse water seal's second air inlet 321. This achieves intrinsic safety by combining the three functions of backflow prevention, pressure stabilization, and fire prevention.

[0069] The positive water seal 3 - 1 is further provided with a first water replenishment port 313 , a first liquid level display and control port 314 , a first drain port 315 and a circular first sight glass 316 for observation.

[0070] The reverse water seal is also provided with a second water replenishment port 323, a second liquid level display and control port 324, a second drain port 325 and a circular second sight glass 326 for observation.

[0071] The wind-solar hydrogen production system also includes a DCS (Distributed Control System) control system.

[0072]

Low-pressure hydrogen storage module

[0073] The low-pressure hydrogen storage module 4 is a wet single-section vertical lift gas holder, comprising a water storage unit 41 and a sealing unit 42 arranged on the upper part of the water storage unit; the water storage unit 41 is a water tank; the sealing unit 42 is a bell jar.

[0074] The water storage unit 41 and the sealing unit 42 are connected by a vertical lifting rail, so that the liquid level of the low-pressure hydrogen storage module can rise and fall with the pressure change, thereby achieving the purpose of pressure stabilization.

[0075] The water storage unit 41 is provided with a third air inlet 416 , and the first air outlet 312 of the positive water seal 3 - 1 and the second air inlet 321 of the reverse water seal 3 - 2 are connected to the third air inlet 416 through pipelines.

[0076] A counterweight is provided on the top of the closed unit 42, and the pressure in the water storage unit is adjusted by the counterweight.

[0077] The low-pressure hydrogen storage module 4 is further provided with a liquid level monitoring unit, which is a liquid level gauge. The liquid level in the low-pressure hydrogen storage module is monitored in real time by the liquid level gauge and transmitted to the control system.

[0078] The water storage unit 41 is provided with a third water replenishment port 411 , a steam inlet 412 , a circulating water inlet 413 , a steam condensate outlet 414 , a drain port 415 , a replacement drain port 417 and a condensate drain port 418 to achieve hydrogen storage.

[0079] The closed unit 42 is provided with a replacement port 421 and a venting port 422 to achieve the purpose of system replacement and safe operation of starting and stopping.

[0080] Example 2

[0081] The method for producing hydrogen from wind and solar power includes the following steps:

[0082] S1. In the wind-solar hydrogen production system of Example 1, the electric energy generated by the photovoltaic power generation module 1-2 and the wind power generation module 1-1 is used to power the water electrolysis hydrogen production module 2, and the water electrolysis hydrogen production module 2 (the temperature in the water electrolysis hydrogen production module is controlled at 80-90°C) electrolyzes water to produce hydrogen and oxygen. The prepared hydrogen passes through the positive water seal 3-1 and is stored in the hydrogen gas tank through the pipeline through the third air inlet 416 of the low-pressure hydrogen storage module 4, and is compressed by the water ring hydrogen compressor (the compressor performance parameter is an inlet pressure of 5kPa) for use by the downstream hydrogen module 6; wherein, the oxygen outlet pressure of the water electrolysis hydrogen production module 2 is 12kPa, and the hydrogen outlet is set to 15kPa through the pressure regulating valve, and the pressure delivered to the hydrogen gas tank through the pipeline through the positive water seal 3-1 is always a stable 5kPa;

[0083] S2. When the power generation of the photovoltaic power generation module 1-2 and the wind power generation module 1-1 is greater than the power consumption of the water electrolysis hydrogen production module 2, the electric energy storage module works to store the excess power generation;

[0084] S3: When the hydrogen storage in the low-pressure hydrogen storage module 4 is greater than the preset maximum value, it is fed back to the water electrolysis hydrogen production module 2, which stops working or reduces the power, and the excess power generation is stored in the electric energy storage module;

[0085] S4. When the power generation of the photovoltaic power generation module 1-2 and the wind power generation module 1-1 is less than the power consumption of the water electrolysis hydrogen production module 2, the hydrogen stored in the low-pressure hydrogen storage module 4 passes through the reverse water seal 3-2 and is compressed by the water ring hydrogen compressor and then supplied to the downstream hydrogen module 6 for use. At the same time, it flows back to the water electrolysis hydrogen production module 2 to stabilize the hydrogen outlet pressure of the water electrolysis hydrogen production module 2; when the hydrogen stored in the low-pressure hydrogen storage module 4 is less than the preset minimum value, the electric energy storage module is turned on to supply power to the water electrolysis hydrogen production module 2.

[0086] When the hydrogen consumption of the downstream hydrogen module 6 is 500Nm 3 / h, and when hydrogen is used continuously for 24 hours, the hydrogen storage capacity of the low-pressure hydrogen storage module 4 is designed to meet the 24-hour hydrogen use of the downstream. The designed hydrogen storage capacity of the low-pressure hydrogen storage module 4 is 500*24=12000Nm 3 The wind-solar hydrogen production system of this embodiment is used to produce hydrogen by wind-solar power generation. If the electrolysis water hydrogen production module 2 operates at full load for 6 hours a day (within 24 hours), then a 12000Nm 3 / 6h=2000Nm 3 / h water electrolysis hydrogen production module 2, can be a 2000Nm 3 / h or 2 units of 1000Nm 3 / h atmospheric pressure square electrolyzer for hydrogen production.

[0087] The above descriptions of the embodiments of the present invention are illustrative. However, the scope of protection of the present invention is not limited to the above-described embodiments. Any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A wind-solar hydrogen production system, characterized in that: The wind-solar hydrogen production system comprises: a photovoltaic power generation module, a wind power generation module, a water electrolysis hydrogen production module and a low-pressure hydrogen storage module, wherein the water electrolysis hydrogen production module and the low-pressure hydrogen storage module are connected by a pipeline, and a positive water seal and a reverse water seal are provided on the pipeline; The positive water seal has a first air inlet at the left end of its top, and a first air outlet at the right end of its top; the reverse water seal has a second air outlet at the left end of its top, and a second air inlet at the right end of its top; the first air inlet of the positive water seal is connected to the second air outlet of the reverse water seal, and the first air outlet of the positive water seal is connected to the second air inlet of the reverse water seal; The low-pressure hydrogen storage module is a hydrogen gas cabinet, comprising a water storage unit and a closed unit arranged on the upper part of the water storage unit, wherein the water storage unit and the closed unit are connected by a guide rail; The water storage unit is provided with a third air inlet, and the first air outlet of the positive water seal and the second air inlet of the reverse water seal are respectively connected to the third air inlet through pipelines; A counterweight is provided on the top of the closed unit; The water storage unit is provided with a third water replenishment port, a steam inlet, a circulating water inlet, a steam condensate outlet, a drain port, a replacement drain port and a condensate drain port; The closed unit is provided with a replacement port and a venting port.

2. The wind-solar hydrogen production system according to claim 1, characterized in that: In the wind-solar hydrogen production system, the photovoltaic power generation module and the wind power generation module are arranged in parallel and connected in series with the water electrolysis hydrogen production module.

3. The wind-solar hydrogen production system according to claim 1, characterized in that: The wind-solar hydrogen production system also includes an electric energy storage module, which is arranged between the photovoltaic power generation module, the wind power generation module and the water electrolysis hydrogen production module, or is arranged inside the water electrolysis hydrogen production module.

4. The wind-solar hydrogen production system according to claim 3, characterized in that: The electrical energy storage module is selected from one or more of a gravity energy storage module, a chemical energy storage module and a battery energy storage module.

5. The wind-solar hydrogen production system according to any one of claims 1 to 3, characterized in that: A cathode electrode is provided at the top left end of the electrolytic water hydrogen production module, and the cathode electrode is connected to the positive and reverse water seals through pipelines; an anode electrode is provided at the top right end of the electrolytic water hydrogen production module, and the anode electrode is connected to the oxygen collection module through pipelines.

6. The wind-solar hydrogen production system according to claim 5, characterized in that: The hydrogen storage capacity V storage of the low-pressure hydrogen storage module is in accordance with the following formula (1): V 储 =V h ×24 (1) Among them, V h The hourly hydrogen consumption of the downstream hydrogen module.

7. The wind-solar hydrogen production system according to claim 6, characterized in that: The hydrogen production capacity of the water electrolysis hydrogen production module is V 产 It complies with the following formula (2): V 产 =V 储 / T (2) Wherein, T is the cumulative full-load operation time of the water decomposition hydrogen production module.

8. The wind-solar hydrogen production system according to any one of claims 1 to 3, characterized in that: The hydrogen outlet pressure of the water electrolysis hydrogen production module is 3-20 kPa; the hydrogen outlet pressure of the low-pressure hydrogen storage module is 2-15 kPa.

9. The wind-solar hydrogen production system according to any one of claims 1 to 3, characterized in that: The wind-solar hydrogen production system also includes a hydrogen compression module, which is connected to the water electrolysis hydrogen production module, the positive water seal and the reverse water seal through pipelines.

10. A method for producing hydrogen from wind and solar power, characterized in that: The method comprises producing hydrogen using the wind-solar hydrogen production system described in any one of claims 1-9.

11. The method for producing hydrogen from wind and solar power according to claim 10, wherein: The electricity generated by the photovoltaic power generation module and the wind power generation module is used as the energy of the water electrolysis hydrogen production module. The water electrolysis hydrogen production module produces hydrogen and oxygen. The hydrogen produced by the water electrolysis hydrogen production module is sent to the low-pressure hydrogen storage module for storage through a positive water seal.

12. The method for producing hydrogen from wind and solar power according to claim 10 or 11, characterized in that: The steps include: S1. The electricity generated by the photovoltaic power generation module and the wind power generation module supplies power to the water electrolysis hydrogen production module. The water electrolysis hydrogen production module electrolyzes water to produce hydrogen and oxygen. The prepared hydrogen is stored in the low-pressure hydrogen storage module after passing through the positive water seal and the reverse water seal, and / or is compressed by the hydrogen compression module for use by the downstream hydrogen use module; S2. When the power generation of the photovoltaic power generation module and the wind power generation module is greater than the power consumption of the water electrolysis hydrogen production module, the energy storage module works to store the excess power generation; S3. When the hydrogen storage in the low-pressure hydrogen storage module exceeds the preset maximum value, the hydrogen is fed back to the water electrolysis hydrogen production module, which stops working or reduces the power. The excess power generation is stored in the electric energy storage module. S4. When the power generation of the photovoltaic power generation module and the wind power generation module is less than the power consumption of the water electrolysis hydrogen production module, the hydrogen stored in the low-pressure hydrogen storage module is consumed first; when the hydrogen stored in the low-pressure hydrogen storage module is less than the preset minimum value, the electric energy storage module is turned on to supply power to the water electrolysis hydrogen production module.

13. The method for producing hydrogen from wind and solar power according to claim 12, wherein: In step S1, the hydrogen outlet pressure of the water electrolysis hydrogen production module is 3-20 kPa.

14. The method for producing hydrogen from wind and solar power according to claim 12, wherein: In step S1, the temperature in the water electrolysis hydrogen production module is controlled at 80-90°C.

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